WatchMon-CORE to suit CellMate-K9

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WatchMonCORE to suit CellMate-K9

CellMate-K9 for Share Balancing Wiring (3 - 16s)

Choose the options to go with your WatchMonCORE:

CellMate-K9  is our new cell monitor capable of monitoring batteries between 3s and 16s. 

  • Individual cell monitoring
  • Balancing your battery pack to keep them safe
  • 3s to 16s with a single CellMate-K9
  • Many CellMate-K9 can be daisy-chained to grow your system.
  • High Voltage by combining CellMate-K9s to get to your desired configuration.
  • Parallel banks or Multi-string with one CellMate-K9 per bank.
  • Suitable for use with OEM Shared loom batteries
  • Capable of measuring 0.50 to 5.00V per cell
  • Designed with Lithium batteries in mind. 
  • Suitable for all types of Lithium batteries including NCA, NMC, LMO, LFP and LTO (*Please request the LTO variant if required)
  • 4 temperature sensors to measure cell temperature
  • Mounting holes to enable the addition of a 60mm fan to boost balancing performance
  • Simple, robust design
  • One CellMate-K9 can measure a single bank or part of a larger bank
  • Pluggable connectors for easy wiring.
  • Communicates with the new WatchMonCORE to give you maximum control
  • Using WatchMon Toolkit is very configurable and powerful

Support Content



Introducing the next generation of WatchMon supervisors. This revamps takes the lessons we have learnt from WM4 and builds on this proven platform with a few new features.

WatchMonCORE will be the core building block and additional components will link to this supervisor in the future. 


  • Versatile Supervisor works with both distributed and centralised cell monitors
  • User-configurable parameters and control logic
  • Configurable 30vdc 5Amax relay (i.e. remote circuit breaker trip, contactor or fan)
  • Additional inputs/outputs via Expansion Board purchased separately
  • Compatible with all Expansion Board (series 1, 2, or 3)
  • Clock with a backup battery
  • Data logging of key metrics for 10 years
  • Firmware upgrades via USB
  • 4-stage display of State of Charge (SoC%) 
  • External ambient temperature sensor
  • Easy to use pluggable screw-terminal connectors
  • Link to Shuntmon with 500A or 1000A power rating 

Remote Communication

  • WiFi connectivity (normal, disabled, or read-only)
  • CAN bus Opto-Insulated to remote charger/inverter equipment
  • Future feature to connect to the cloud portal via MQTT (secure link).

 Power Input

  • Built-in 8v to 30v DC-DC supply
  • With WiFi-enabled consumes ~1.7W (Typical 48v battery budget 1Ah/day)
    • When powering the WatchMonCORE (version 4.5) with a supply above 30Vdc (i.e. 48V battery pack voltage), always connect to an isolated DC-DC (ideally 24Vdc) to ensure a robust, long-term, and reliable product. 

    Optional Extras that can be Purchased: 

    • TestMon - checks and confirms your wiring
    • Expansion Board
    • 500A or 1000A Shunt Monitor
    • TestMon16
    • Extra Support - * Email fair use is included free but if you need more help and advanced technical assistance, you can buy upfront or later on an as-needed basis via Zoom or similar.


    Optional Expansion Board (Series 3) details

    • 3 x Mechanical 30Vdc 5A relay outputs
    • 3 x Solid state relay SSR 65vdc 5Amax isolated modules outputs (1A cont.)
    • 2 x Isolated inputs 5-65vdc sensor channel
    • 2 x ADC 0-5vdc (future development option)
    • 1 x RS485 Serial port (future development option)
    • 1 x Remote Addressable LED (future development option)
    • Compatible with all supervisors


      Mounting a Fan

      CellMate-K9 has been designed to allow a 60mm Fan to be mounted to enhance balancing performance if the customer desires. 

      *Fan and standoffs are not supplied.

      • M3 screws to mount Hex standoffs to the CellMate-K9
      • Standoffs should be 30mm in height in order to clear the heat sink.
      • Fan hole centres are 60mm apart.
      • Fan power can be triggered by the logic of the WatchMon CORE 
      • Adopt one of the Relay/SSR to switch the fan power.
      • Fan selection is a customer choice, Voltage (12,24,48,5V) etc.
      • The fan is not to be powered from the onboard 5V DC-DC of the WatchMon CORE

      Helicopter Preview of the Product with Optional Expansion Board 3:

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